Typical deployments have sufficient bandwidth to handle peak network load. Adequate bandwidth reduces errors, collisions, and dropped packets. Use the netstat tool to determine the network statistics.
Several operating systems provide TCP/IP tunable parameters for tuning network intensive servers. For information, refer to the documentation for the operating systems.
If the network is the bottleneck, you should increase the bandwidth. Configuring a dedicated private network between the application servers and the eDirectory server might also help in reducing the network congestion.